FixedInvalid structured data in RM reviews

Member

It says 'Review-aggregate' doesn't support 'average' or 'best' properties. Also individual reviews have no markup at all (despite they have already mentioned 'average' and 'best', there is no corresponding surrounding markup for each review (at least I haven't found one)).

Looks like we should migrate microdata markup to schema.org' one, as data-vocabulary.org is not supported any more.